<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title></title>
	<style>
		div{
			/*color: transparent;*/
			width: 200px;
			height: 200px;
			background-color: red;
			/*制作圆角*/
			/*border-radius: 3px;*/
			/*border-radius: 100px;*/
			border-radius: 50%;
			
			

		}
	</style>
</head>
<body>
	<div>
		

	</div>
	
</body>
</html>